Improved arrangement of steam-boilers



UNITED STATES PATENT OEEICE.

WILLIAM BARNHILL, OF PITTSBURG, PENNSYLVANIA'.

IMPROVD ARRANGEMENT OF STEAM-BOILERS.

Specification forming part of Letters Patent No. 8,768, dated March 2,185.2.

To LZZ wiz/0m it may concern:

Be it known that I, WILLIAM BARNHILL, of the city of Pittsburg, in thecounty of Allegheny and Commonwealth of Pennsylvania, have made andinvented a new and Improved Mode of Constructing Steam-Boilers; and I dohereby declare that the following is a full and exact descriptionthereof, reference being had to the annexed drawings and letters markedthereon, forming part of this specification.

A cylindrical boiler, E, is suspended from the inner rim of the large oroutside boiler, G, as represented in the front and side elevations shownin the annexed drawings. The forward end of the cylindrical boiler Erests upon the side of the forward water-chamber, I, of the large boilerG.' The back end and middle of the cylinder or boiler E are connectedwith the rim of the large boiler G at the openings C by plates or ringsD and bolts R. The inner cylindrical boiler, E, contains iiues F,extending from the back end of the boiler E to the forward end of thelarge or outside boiler, G. Through the back end of the boiler G is anopening, S, with a door, T, opposite to the end of the inner boiler, E,to afford access to the fines F to clear or replace them when theybecome foul or worn out. The lire-place is in the interior of the largeboiler G, between the water chambers or spaces I. The iiame or heat fromthe iire passes along between the inner rim of the large boiler G andthe outside surface of the boiler E to the back end of the latter,thence along the passage P between the back end of the boiler E andthewatenohamber at the back end of the large boiler G, and thence returnsthrough the lues Fto the chimney at the forward end of the large boilerG.

I am aware that it is not new to locate a cylindrical water-vessel inthe iue of a boiler, and also that such vessel sometimes containedlines; but these flues were in this instance direct lines, and thelire-box was placed outside of the boiler proper.

What I claim, therefore, as my invention, and desire to secure byLetters Patent, is

The arrangement of the cylindrical boiler having return-nues thereinwithin the flue vof the main boiler in such manner that the front end ofsaid cylindrical vessel extends over the lire-grates, and so that nearlyits whole outer surface is exposed to the action of the flames, gases,dac., which after their passage through the annular flue proceed to thechimney through the small iues in said cylindrical vessel.

IVM. BARNHILL.

Vitnesses:

WVM. WILLsoN, B. B. CAMPBELL.

